A gunman who announced online that he was planning to shoot two "pigs" in retaliation for the police chokehold death of Eric Garner ambushed two officers in a patrol car and shot them to death in broad daylight Saturday before running to a subway station and killing himself, authorities said.

The controversy over GMOs (genetically modified organisms) continues. Are GMOs a health risk? Or, are they the answer to world hunger and malnutrition? And most recently, should foods containing GMOs be labeled?